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並前往https://www.khanacademy.org/math/cc-2nd-grade-math/cc-2nd-add-subtract-100/cc-2nd-add-100/v/understanding-place-value-while-adding-tens

Understanding place value when adding tens (video) - Khan ...

[Voiceover] So in the number 23, we have a two in the 10's place. So, that two literally represents two 10s. And we see it right over here.

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